code: def _clear_cached_macosx_ver():
      """For testing only. Do not call."""
      global _syscfg_macosx_ver
      _syscfg_macosx_ver = None
  
imports: import importlib.util
  import os
  import re
  import string
  import subprocess
  import sys
  import sysconfig
  import functools
  from .errors import DistutilsPlatformError, DistutilsByteCompileError
  from ._modified import newer
  from .spawn import spawn
  from ._log import log
label_desc: Use image node_id 3 for calling a global function with example usage: _clear_cached_macosx_ver() without return types